FWIW he has shown some improvement at the plate this year, while a .634 OPS, 75 OPS+ isnt going to turn any heads it should be noted you CAN live with that sort of production from a back up/3rd catcher, especially when said catcher is:
1. Excellent defensively, Butera might be the best defensive catcher in baseball.
2. There is nobody better to replace him with. (Towles has struggled and everyone else is too far away)
3. It's not like he is keeping someone off the bench, i.e. when Parmelee was on the roster he was basically rotting on the bench.
I'm not the largest fan of "personal catchers", however its hard to deny his success with Liriano and no DeDuno, perhaps he is the latin pitcher whisperer after all?
Either way, I will root for the guy, he is a master of his craft defensively and has made it to the bigs for 2+ years now possesing hitting skills the majority of NCAA players could match, its kind of a neat story.
If he can somehow continue to post an OPS+ above 70 (I'm not saying he will) then he is an acceptable back up catcher in the major leagues.